[issue8407] expose signalfd(2) and pthread_sigmask in the signal module

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> There's a race. If a signal is received while is_tripped is set, 
> the signal number won't be written to the wakeup FD.

Oh, nice catch. The "bug" is not new, Python behaves like that since Python 3.1. But in Python < 3.3, it doesn't mater because I don't think that wakeup was used to watch more than one signal. One trigger "something happened" was enough.

The wakeup fd now contains the number of each signal, and so the behaviour has to change. I applied your patch and I added a test.

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<http://bugs.python.org/issue8407>
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